Fix: Cinder Volume Backup not working

Maximilian Brandtrequested to merge
fix/cinder-volume-backup into devel

To connect to the volume, Cinder uses os_brick.

File "/usr/local/lib/python3.8/site-packages/os_brick/initiator/connectors/rbd.py", line 106, in _create_ceph_conf
  keyring = cls._check_or_get_keyring_contents(keyring, cluster_name,
File "/usr/local/lib/python3.8/site-packages/os_brick/initiator/connectors/rbd.py", line 93, in _check_or_get_keyring_contents
  raise exception.BrickException(msg=msg)
os_brick.exception.BrickException: An unknown exception occurred.

FileNotFoundError: [Errno 2] No such file or directory: '/etc/ceph/ceph.client.a.cinder.keyring'

This requires the Ceph keyring to connect to Ceph. I added the keyring with the Ceph config.

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